Process for pressing glass articles.



T. C. STEIMER.

PROCESS FOR PRESSING GLASS ARTICLES.

APPLIUATION FILED NOV. 2, 1908 Patented Jan. 19,1915.

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- been p ssible heretofore to pro in a UNITED STATES Pi ltTEN l" THEODORE C. STEIHER, OF DORMONT, PENNSYLVANiA.

PROCED S FOR PRESSING GLASS ARTICLES.

applica tion filed No fember 2. 1908. Serial No. 460.649.

To all whom it may concern Be it known that I, T nnononn C. Srrfnluzn, a citizen of the UnitcJ States, residing at Dormont, in the county of Alleghem', State of Pennsylvania, have invented a certain new and useful Process for Pressing Glass Articles, of which the following isa specific'ation.

My invention relates to the art of making hollow articles of glass or similar material in a press mold; its primary object be ing to produce an article having both ends open, finished complete in the mold itself.

Another object is to provide for efficiently forcing the glass into interstices of the mold through a large opening, and yet make it easyto remove the surplus glass.

.Still' other objects will hereinafter appear. I have illustratedthe'process ,in the accompanying drawing showing a simple form of mold adapted surplus of glass after formin the article.

' Figure l is a central vertical section of the moldshowing an article like a lampshade being pressed therein. and Fig. 2 is a similar section with the parts of the mold in a difl'ercnt position, to finish the process. Fig. 1 is a partial cross-section on the dotted line (X) in Fig. Land Fig.3 is aperspective sketch. of a lamp-shade finished as it comes from the mold. Fig. 4 illustrates modification of the process and Fig. illustrates-one of the practices in the prior art.

It has heretofore been very difiicult to press an article with one open end in a mold and leave it in such condition as to make it feasible to cheaply provideanother openins. In making a lamp-shade for example. it was necessary to form the article in a dished-shape with no opening at the bottom. but the glass was weakened by being made thin, at the point 7 illustrated in Fig. 5. so that after removal from the mold the block of extra glass X could be knocked out after which the broken and ragged edge was made smooth bv an add tional operation, Hana-rally by grinding. That is; it has not mold an article ofa general ring form with two openings. The best that could be done was to make such an article as a lam -shade for example. in the form shown in Fig. 5, and even in this it'was absolutely necessary to press downward so that the gravity, assisted Specification of Letters Patent.

for practising thesame and designed to entirely separate the- -to the usual custom.

Y shown in Fig. 1 the easement Patented in flowingthe glass through;.theqnanrowl. space at 3/ into the membqdy'iofathmmdldy It IS lJQllG'VGCl such-an articl'e ease shownin Fig. 3, could not have been-madmat nllhby..

flowing the glass throughwstmh miner-row; opening, as it would be practicalzlyimpos'sim ble to force the glass into-the .smal'lieavitiesz and depressions'of the mold quieklyienoughy" without causing Clll'lkllnguiz'if" flig-f Z In my process, the articleisfirst itormedby pressing the glass downward from' a large body of glass with the .greatestposstm ble opening, and then theiglasslisf; removed and an op'ening'.; made;before iiee. moral from the mold and whilestheighw Tlu sin the drinvings, Irklle shown a mold in which there ismintetion ry former 7 mounted. upor. thQFbRSQi shampoo; this neatly" fit s veral serti'ons" 8;:8a-ofm: sepaasf. rable mold. The sections 8 have cut iht'o their surfaces-depression:-. for-forming th article, such as'shown in Fig.3) andw-here thereare to be open spaces.ofiieouitsenflle. entirebody of the article. is to n.1 $195k. these depressions in part8, tl'ieinteriiiediaitw surfaces of the, mold. 8 between omnings; fitting the former 7 ClO'SGlYI-aarllhfl:SQQfiifinS; are open on top of the mold pindlaccordimg I semglessmetin g." ring 9, in which the charge met s. placed, and any convenient'plu a ters therein. being made'to 'fit lneaifllyranc place b means oftheringlLJ' 'As the plunger desc, "ds ftgithe;position; 1 glass: forced down and fills alldthenm tet'tigies ofg the mold it thus flowine fullifthnonglnehel central body' portion. The plungenbeing now raised, as indicated in Fig. 2(thejcen tral opening for the bottom of the article is made by the motion of the'punching-or cutting plunger 12 which, has hearings in the male mold 7 and'a'guide stud 13 on the base 6, and is operated powerfully by means ofa toggle link 14:.and the bell-cranklever 15. as will be plunger 12 is here shown as-neatly fitting the cutting edges 16 of the ring 9. so that the opening is made complete-and clean in final form, and the excess mass of glass G is entirely separated from the article. The article is removed from the and finished form. Otherwise I- of course may make the plunger 12 a little smaller, which will leave a slight neck on the article as shown in Fig. 4, and it will be underplain from the drawing. The.

mold in complete stood that this may be readily cracked ofi' .a'nd groundand smoothed in order to finish the article as in the former practice. Theglass has thus, however,.alreadybeen flowed intothe mold not through the narrow neck but through. the full opening.

The advantages of this process'willi-be readily apparent to those familiar with the. art and it will of course beunderstood that I am not limited to the mold remaining stationary, and the cutting plunger moving, norto any particular mechanism for accomplishing the purpose of my method. "The flowing-of the glass into the recesses of the mold through a large opening and flowing downward, makes'it possible to form in a mold delicate and intricate patterns of ar- I ticles which never have'heretoforebeen made.

- The separation. of the surplus glass from the article itself while still in' the mold does away with all the' supplementary processes 'of cracking off and removing parts of the article after it is. taken from the mold; .In fshortgvthe process enables the production of an openjended article in a press mold in complete and final form, all itssurfaces being finished:

. Having thus described my invention and illustrated its use, whatI' claim asnew and,

desire to secure by Letters Patent, is the following: i

- l; The process of forminga' glass article,

with a central opening byvfirst'pressing the entire article with a solid center froma font 3 and then cutting an opening in the center I while the article remains in place in the 2. The process" ofmaking open center glass articles by pressing molten glass from a full font into a closed mold, and afterward cutting out an opening in the article while the glass forming the article is still V entirely in.'con'tact with the mold,

, f 3. The process of forming-an open center glass article by pressing it first in its gene eral form'w'ith a solid center, meanwhile flowing the glass downward from said. solid center, and then cutting a centralopemng 7 by means of a movable part of the mold and ii so before removal from the mold. 4. The process of making hollow glass articles with an open center or stem, which comprises pressing the article downward y from a full. font in the center of the article, I

and afterward punching out-and completely cutting off the surplus glass in the center and thereby forming a central openingwith its entire surface in contact with the mold.

5. The method of forming-hollow glass I articles with a hollow base or stem; consisting in forcing glass from a font around-and over a stationary core, and simultaneously forming a solid *base'betweenthe fontand article, and then forcinga plungerthrough the core and the solid base; to form the hollow base or stem.

6. The method of forming a hollow glass ing in feeding the glass into a'font, forcing the glass from the font and over a stationary core and into the solid base portion between the article and the font to'form a hollow base or stem..

, 7. The method of forming article with a hollow stem or base; consistcore, andthen forcing a plunger through the articles consisting in forcing the glass] the font into a mold having a'stationary core with-a central core movable through it and then forcing the central core into the portion .ofglassbetween the stationary core andthe font.

8. The method of; forming hollow glass,

articlesconsisting i-nfor'cing the glass from 1 a font into. a mold having' a stationary core with a central core movable through it and then forcing the central core into'the portion 

